OBJECTIVE To investigate the epidemiology of hospital acquired pneumonia(HAP) in surgical patients admitted to intensive care unit(ICU),to provide evidence for clinically reasonable administration of antibacterial agents and acquire the composition of pathogenic bacteria and its resistance.METHODS 100 patients with HAP admitted to hospital between 2008 and 2009 were analyzed to get bacteria distribution and clinical characteristics.RESULTS Among gram positive bacteria,Staphylococcus aureus accounted for 42....